25978111499 has 2 divisors, whose sum is σ = 25978111500. Its totient is φ = 25978111498.

The previous prime is 25978111483. The next prime is 25978111561. The reversal of 25978111499 is 99411187952.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25978111499 - 2⁴ = 25978111483 is a prime.

It is not a weakly prime, because it can be changed into another prime (25978111459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12989055749 + 12989055750.

It is an arithmetic number, because the mean of its divisors is an integer number (12989055750).

Almost surely, 2^25978111499 is an apocalyptic number.

25978111499 is a deficient number, since it is larger than the sum of its proper divisors (1).

25978111499 is an equidigital number, since it uses as much as digits as its factorization.

25978111499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The spelling of 25978111499 in words is "twenty-five billion, nine hundred seventy-eight million, one hundred eleven thousand, four hundred ninety-nine".